Hi Tristan and List, > I am trying to predict some satellite encouters with the Cola > and Allcola programs but I am always getting the following > message: > 'Convergence problem with #xxxxxx: orbits may coincide. > Anyone got the sollution ? As some other list members have suggested, this can happen when physically linked satellites (e.g. the various elements of ISS) each have their own TLEs. The differences in the orbits are small, but non-zero, so they slowly drift apart. However, I'm sure Tristan is aware of this and probably ignores convergence errors that are reported for physically connected satellites. He's correct: I've noticed this error still comes up at times between apparently unrelated objects. Bjoern Gimle has mentioned this problem to me on several occasions, but I haven't had time to dig into the code to see what it is about these orbits whose comparative differences cause COLA (and ALLCOLA) problems. If I find a solution (even a partial one) I'll certainly post an update. Best, Rob ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
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